Tunneling-machine



LE ROY W.- CAMPBELL. TUNNEUNG MACHINE.

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TU'NNELING MACHINE. APPLICATION F'ILED AUG-18, 1915.

' Patented Apr.6, 1920.

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LE RO Y w. CAMPBELL. TUNNELING MACHINE. APPLICATION FILED AUG. 18. 1915.

V Patented Apr. 6, 1920.

9 SHEETS-SHEET 3- LE ROY W. CAMPBELL TUNNELING MACHINE.

Pm m w 3 gm M9 3% \g M/ LE ROY W. CAMPBELL. TUNNELING MACHINE. v APPLICATION man AUG-1'8. 191s. 1,335,723, Patented Apr. 6, 1920.

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TUNNELING MACHINE.

APPLICATION FILED AUG- ,81 1915- Patented Apr. 6, 1920.

9 SHEETSSHEET 6.

ms Wm mm LE ROY W. CAMPBELL. TUNNELING MACHINE. APPLICATION FILED AUGJB, 191;.

Patented Apr. 6, 1920.

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T'UNNEL ING MACHINE. APPLICATION FILED AUG, 18. I915.

LE ROY w. CAMPBELL. I

TUNNELING MACHINE. APPLICATLON FILED AUG.I8, 1915.

Patented Apr. 6,1920.

9 SHEETS-SHEET 9.

v [WI/6772507 KW fligg hiw WLCI LE ROY VJ. CAMPBELL, F GRAND RAPIDS, MICHIGAN;

TUNNELING-MACHINE.

Application filed August 18, 1915.

To all whom, it may concern o it known that 1, Ln ROY l/V. CAME" a citizen of the United States, residing .i Grand Rapids, in the county of Kent and State of Michigan, have invented new and useful Improvements in Tunneling lfachines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, fo ming a part of this specification.

My invention relates to tunneling machines and more specifically to tunneling machines of the type provided with a rotatable radially movable cutter bar.

One of the objects of my invention is to provide an improved machine of the character indicated which shall be well constructed and efficient in operation.

Further objects will appear from the dctaiied d scription to follow and from the appended claims.

in the drawings, in which E 11 ve illusrated two en'ibodiments of my invention Figure 1 is a side elevation of a tunneling machine showing the carriage mounted on the track;

Fig. 2 is an end view of the front of the machine Fig. 3 is a section substantially on the line 33 of Fig. 2, showing the transmission mechanism for rotating the boring bar and effecting the radial movement of the cutter;

Fig. lis a plan view of a modification of the tunneling machine in which the motor, boring mechanism and driving mechanism are mounted on a sliding carriage; and

Fig. is a side elevation of the modification Fig. 4;.

Fig. (i is a plan view view of the machine shown in Fig. l;

Fig. 7 is a section on the line 77 of Fig. 6;

Fig. 8 is a section on the line S-8 of Fig Fig. 9 is a section on the line 9-9 of Fig. 8;

10 is a plan view of the mechanism for shifting the friction disk;

Fig. 11 is a section on the line 11-11 ot' Fig. 10; and

Fig.12 is a plan view of a form of tunnelin machine in which the entire machine moves ward as the excavation proceeds; and

Specification of Letters Fatent.

Patented A r. 6, 1920.

Serial No. 16,262.

Fig. 13 is a side elevation of Fig. 12..

Referring now to the drawings in detail, and first to Figs. 1, 2 and 3, the tunneling n achine shown comprises a carriage, 10, a boring mechanism 11 supported by the carriage, feed mechanism 12 for causing the boring mechanism to travel in an axial direcion, feed mechanism 13 for causing the boring bar to travel in a radial direction, amotor l-fl for driving thevarious mechanisms, driving transmission mechanism 14 for elfecting the rotation of the boring shaft, and a conveyer 15 for removing the material which is freed by the boring mechanism.

The carriagelO comprises a: rectangular frame 16 mounted on wheels 17 which rest on'the track 18 whereby the machine can be advanced as the tunnel progresses.

The boring mechanism 11 comprises a boring shaft 19, a cross head 20 secured to the shaft 19, a boring bar 21 slidably mounted on the head 20 to move in a radial direction, a cutter or cutters 22 secured to the boring bar 21 and movable therewith, and a center cutter 23 fixedly securedto the boring head 20. The shaft 19 is threaded for a portion of its length as shown at 24, for engagement with a nut 25, Fig; 1, and is provided with a keyway 26 for engagement with keys Y27 and 28 connected with i the transmission mechanism 14; and boring head 20, respectively. The boring head 20 is provided with two L-shaped guides 29 and 80 which engage channels 31 and 32, respectively, in the boring bar 21 to guide the boring bar in its radial movement. Rollers 33 may be provided to lessen the friction of the boring bar in its radial movement. Brackets 84: are fixedly secured to the boring head 20 and are provided with friction rollers 35 to lessen the friction on the boring bar. The boring bar 21 is provided with a rack portion 35 for use in effecting its radial movement.

The center cutter 23 is provided with a cutting ed e 36 for making a conical center cut and is also provided with cutting edges 37 and'38 for effecting a cylindrical cut at the edge of the conical cut. The cutter 23 is connected to the boring head 20 by means of a shank 39 clamped between the head 20 and the guide bracket34. The cutter 22 is provided with cutting edges 40 and 41 for making the edge and face cuts, respectively, as the cutter bar moves radially outward.

NT FTQ.

The radial feed mechanism 13 comprises a pinion 42 meshing with the rack 35" on the boring bar, a shaft 13, on which the pinion 42 is secured, mounted in suitable bearings on the boring head, a spiral gear %4 secured on the shaft 13, a spiral gear 15 meshing with' the gear Q4: and secured on the shaft 16, a bearing 17 secured on the boring head in which the shaft d6 is mounted, a spur gear 18 secured on the shaft a6, a gear 19 having a spur gear portion 19 rotatably mounted on the shaft 19 meshing With the spur gear 18, and a bevel gear portion 50, a bevel pinion 51 meshing with thebevel gear portion 50, a shaft 52 on which the pinion 51 is secured, a bracket having a hub portion 5 1 surrounding the shaft 19 and provided with bearings 55 in which the shaft 52 is mounted, a spiral gear 56 secured on the shaft 52, a spiral gear 57 meshing with the gear-56, a shaft 58 on which the gear 57 is secured, a bearing 59 on the bracket 53 on which the shaft 58 is mounted, a brake mechanism 60 for preventing rotation of the shaft- 58 when desired, a friction drive mechanism 61 for effecting rotation of the shaft 58 when desired, a slide 62 (which may be a steel channel) secured to the bracket 53, and guides 63 and 63 with which the slide 62 engages. Rollers 63 may be provided if desired to lessen the friction between the guides and slide.

The brake mechanism 60 comprises a brake wheel 69'; secured on the shaft 58, a brake band 65 engaging the brake wheel 61,

a rock shaft 66, the movement of which tightens or loosens the brake band on the brake wheel, bearings 67 in which the shaft 66 is mounted, a lever 68 for rocking the shaft 66, and a quadrant 69 for holding the lever 68 in adjusted position.

The friction drive mechanism comprises a friction wheel 70 secured on the shaft 58, a vertically shiftable bearing 71 in which the shaft 58 is mounted, whereby the friction wheel 70 may be moved into and out of engagement with a cotiperating friction wheel, a lever 72 for effecting movement of the bearing 71, a friction wheel 73 for en gaging the wheel. 70, a shaft extension 71 on which the wheel 7 3 is mounted, and a bearing 75 in which the shaft extension 7-1 rotates.

The axial feed mechanism comprises a nut 25 having a threaded engagement with the portion 2a. of the hearing shaft 19, a gear 77 moshing with a gear portion 7 8 on the nut 25, a shaft 7 9 on which the gear 77 is secured, a gear shifting mechanisn'i 80 for moving the gear 77 into and out of mesh with the gear portion 78, and a nut locking mechanism 81 for preventingrotation of the nut 25.

The driving transmission mechanism 1 1 comprises a motor sprocket 82 secured on the motor shaft, a sprocket chain 83 engag ing the sprocket 82, sprocket wheel 8 1 engaged by the chain 88 and secured on the shaft 85, bearings 86 and 87 in which the shafts 79 and are mounted, a spur gear 88 also secured on the shaft 85, a spur gear 89 meshing with the gear 88 and secured on the shaft 7 9, clutch mechanism 90 for throw ing into and out of operation the mechanism for causing rotation of the boring bar, and a planetary gearing 91 for transmitting power between the clutch mechanism 90 and the bOlillg' shaft 19.

The clutch mechanism 90 comprises a clutch member 92 connected to drive the planetary gearing 91, and 'expansible clutch means 93 for effecting a driving connection between the member 92 and the shaft 85 of which the part 711 is an extension) and a clutch lever and connections 94 foroperating the expansible clutch means.

The planetary gearing 91 comprises a casing 95 fixedly secured to the carriage 10, a plurality of annular gears 96, 97 and 98 fixedly secured to the inside of the casing 95, a plurality of spur gears 99, 100 and 101 mounted to rotate about the boring shaft 19, a plurality of gear carrying devices 102, 103, and 104: keyed on the hubs of the spur gears 100, 101 and the shaft 19 respectively, a series of spur pinions 105, 106 and 107 meshing with the annular gears 96, 97 and 98 and with the spur gears 99, 100 and 101, respectively, and a series of pins 108, 109 and 110 secured to the gear carrying devices and on which the pinions 105, 106 and 107 are mounted.

The spur gear 99 is provided with a sleeve portion 111 which may be formed integral therewith on which is keyed a spur wheel 112 which meshes with a pinion 113 which is keyed on a hub portion 114C forming part of the clutch member A sleeve 115 sun rounds the boring shaft 19 to separate the spur gears 99, 100 and 101 from contact with the boring shaft 19 to prevent injury to these gears which would result if they came directly in contact with that portion of the shaft which is provided with. the keyway 26. This sleeve 115 is provided with a flange portion 116 which is secured to the gear carrier 104; by means of screws 117. The gear carrier 10% is provided with a sleeve 118 formed integral therewith which a is mounted to rotate in the bushing 119 secured within an opening in the casing 95. The shaft 19 is feathered to this sleeve portion by means of the key 27. The gear 100 is provided with a hub portion 120 on which the gear carrier 102 is keyed and the gear 101 is provided with a hub portion 121 on which the gear carrier 103 is keyed. The

key 27 is held in place and prevented from slipping endwise with respect to the sleeve 118 between the sleeve 115, which is secured to the carrier 104, and a collar 122 which surrounds the shaft 19 and is secured to the sleeve 118, by means of screws 123. The casing 95 comprises a cylindrical portion 124 to which the annular gears 96, 97 and 98 are secured, a head 1.25 having a bearing sleeve 126 in which the sleeve 115 rotates, and a head 12-7 having a sleeve 128 in which the bushing 119 fits. The bracket 53 is held in proper position and caused to move axially with the shaft 19 by means of a collar 129 fitting against the hub portion 54 of the bracket, and secured on the shaft 19 by means of a pin 130. A thrust bearing 131 engages the rear face of the nut 25 to hold the nut from rearward movement and to hold the bOllIlg mechanism to its work. The nut 25 is also held against forward 11103 9: ment in any suitable manner as by engagement with a fixed rib or abutment comprising a collar 132 forming a part of the frame.

The operation of this boring mechanism is as follows: Assuming that thecutter 22 has just finished making a cut, that is, that it has just reached the desired outward limit of its radial travel and that the shaft 19 has been'advanced in an axial direction as far as practicable, that the motor 14 is running, that the clutch lever 94 is in a position to cause rotation of the boring shaft, that the brake 69 is in position to prevent rotation of the shaft 58, that the lever 72 is in position to hold'the friction wheel out of contact with the friction wheel 7 3, that the nut locking mechanism 81 is in position to permit the nut 25 to rotate with the shaft 24, and that the gear shifting mechanism is in position to hold the gear 77 out of mesh with the gear portion 78, the boring shaft 19 will be rotated from the motor 14 through the motor sprocket 82, the sprocket chain 83, sprocket wheel 84, shaft 85, gears 88 and 89, shaft 79, clutch 90, gears 113 and 112, and planetary gearing 91. The gear 49 is held from rotation with the shaft 19 by means of the brake 60 which acts through the shaft 58, spiral gears 57 and 56, shaft 52, and bevel pinion 51 and the bevel gear portion 50 of the gear 49. The boring bar 21 carrying the cutter 22 is caused to travel radially outward on the boring head 20 because of the engagement of the spur gear 48 with the spur gear portion 49' of the gear 49 (which is held from rotation) which causes the spur gear 48 to rotate and with it the shaft 46 and spiral gear 45 which causes the spiral gear 44 to rotate and with it the shaft 43 and pinion 42, which pinion 42, engages the rack 35 on the boring bar 21. The nut 25 (not being held by means of the nut locking mechanism 81) rotates with the shaft 19 (due to the frictional engagement between the nut and shaft). The rear face of the nut 25 engages the thrust bearing to hold the boring mechanism to its work.

The lever 68 is then operated to throw the brake to releasing position so that the gear 49 is no longer held from rotation and the boring bar 21 is no longer forced to move outward radially. The boring bar 7 21 is then allowed to complete the revolution to make a finished circular cut. The lever 72 is then operated to bring the fricfriction wheel 7 3. This will cause the bormg bar 21 and the cutter 22 to travel radi- "75 tion wheel 70 into eiigagement with the ally inward, the friction wheel 73 causing the friction wheel 70 to rotate and with it the shaft 58 and spiral gear 57 causing the spiral gear 56 to rotate and with it the shaft 52 and pinion 51,causing the gears 49 and 48 to rotate and with the latter the shaft 46 and gear 45 causing the gear 44 to rotate and with it the shaft 43 and gear 42 which engages the rack 35 and rotates in a direction to cause the boring bar'21 to move inwardly. Immediately after operating the. lever 72 to bring the wheel 70 into engagement with the wheel 73 the clutch 94 may be operated if desired to cause the expansible clutch means 93 to disengage the clutch member 92 therebydisconnecting the driving mechanism from the transmission which i causes the boring shaft 19 to rotate. Ttis not, however, necessary to stop the rotation of the shaft 19 as the gear ratio is such sprocket chain 83, sprocket'wheel 84, shaft 79 and gear 77 which meshes with the. gear portion 78 of the nut 25;

As the shaft 19 travels rearwardly it carries with it'the' boring head 20, the gear 49, and the bracket 53, the'shaft 19 sliding rearwardly through the .planetary gearing 91, the shaft 58 sliding rearwardly through the bearing 71 and the slides 62 sliding rearwardly through the guides 63 and 63*. When the boring bar 21 has been brought inward as far as necessary or desired the lever 72 is operated to move the wheel 7 Oaway from the wheel 73. After the-boring mechanism has been brought as far rearwardly as desired the gear shifting mechanism 80 is operated to move the gear 7 7 out of mesh with the gear portion 78. The carriage 10 is then moved forwardly on the track 18 until the boring mechanism is again in position to engage the face of the cut and the carriage is then braced in position in any suitable manner. The nut locking mechanism 81 is then operated to hold the nut from rotation. If the clutch 92 has been operated to disconnect the planetary gear it is operated to again connect it up to cause the rotation of the boring shaft 19. This rotation of the boring shaft 19 causes the shaft to be advanced, due to its screw threaded-engagement with the nut 25 (which is now held from rotation) to force the center cutter 23 into engagement with the face of the cut to increase the depth of the center cut. After the shaft 19 and boring mechanismv have been advanced as far as is necessary to make the desired depth of cut the nut locking mechanism 81 is operated to release the nut 25 to permit it to rotate with the shaft 19 (due to its frictional en agement therewith) and the shaft 19 then ceases to advance. The brake lever 68 is then operated to cause the outward feed of the, boring bar 21 as described above.

When the cutter 22 has reached the outer limit of the cut the brake 60 is released and the cutter 22 allowed to make a complete revolution to make a circular cut. The lever 72 is then operated to cause the cutter 22 to move inwardly again. lVhen the cutter 22 has been moved inward as far as desired the lever 72 is operated to separate the wheels and 73 and the nut locking mechanism 81 is operated to lock the nut 25 to cause the shaft 19 to feed forwardly again.

These operations are repeated until the shaft 19 has been advanced as far as is practicable when it will be again withdrawn and the carriage 10 again advanced.

The material removed by the cutters 22 and 23 is directed onto the conveyer 15 by an attendant. The brake wheel 64 and friction wheel 7 O are fastened on the shaft 58 as shown at 133 and 134 to permit the shaft to slide outwardly along with the boring shaft 19.

The rear end of the boring shaft 19 is provided with a roller bearing indicated at 135 in Fig. 1.

In the modification of Figs. 4 and 5 I have, shown a boring machine in which mechanical means are provided for positively moving the cutter radially in both directions and in which the motor, boring mechanism and transmission mechanism are mounted on a sliding carriage. The parts 20, 21, 22, 23, 35, 42, 43, 44, 45, 46, 47 and 48 are substantially the same as in the modification of Figs. 1, 2 and 3 and need not be described in detail.

The machine shown in this modification comprises a roller carriage 136, a sliding carriage 137 mounted on the roller carriage, a motor 138, radial feed transmission mechanism 139 for causing the radial travel of the cutter, mechanism 140 for causing the slid ing movement of the carriage 137, mechanism140 for causing the rotation of the boring shaft, and transmission mechanism 141 between the motor and the mechanisms 139 and 140. The roller carriage 136 comprises the uprights 142 and the guides 143 supported on these uprights on which the sliding carriage is mounted. The sliding carriage 137 comprises the slides 144 which engage the guides 143 and the supporting frame 1.45 on which the motor, boring and transmission mechanism are mounted. The radial feed transmission mechanism 139 in addition to the parts previously enumerated, has substantially the same as shown in Figs. 1, 2 and 3, comprising a gear member 146 rotatably mounted on the boring shaft (including a gear portion 147 for engagement with the gear 48 and a gear portion 148), a gear 149 meshing with the gear portion 148, a shaft 150 on which the gear 149 issecured, bearings 151 and 152 mounted on the frame 145, a gear 153 secured on the shaft 150, a gear 154 meshing with the gear 153, a shaft 155 on which the gear 154 is secured, bearings 156 and 157 in which'the shaft 155 is mounted, beveled gears 158 and 159 secured on the shaft 155,,a bevel gear 160 which alternatively meshes with the gears 158 and 159, a shaft 161 on which the gear 160 is secured, bearings 162 and 163 in which the shaft 161 is mounted, a bevel gear 164 also secur'edon the shaft 1.61, and a bevel gear 165 secured on the counter-shaft 166' A reversing mechanism 167 is provided for changing the oirection of the radial feed of the cutter comprising a slide 168, a guide 169 in which the slide is mounted, two fingers 170 carried by the slide 168 which engage grooves 171 in the hubs of the bevel gears 158 and 159, and lever mechanism 172 for shifting the slide 168 to bring the bevel gears 158 and 159 alternatively into engagement with the bevel gear 160.

The mechanism 140 for causing the sliding movement of the carriage 137 comprises two feed screws 173 located on opposite sides of the carriage, each having a threaded portion for engagement with a threaded member 17 4 mounted on the roller carriage 136, thrust bearings 175 mounted on the sliding carriage 137 with which bearings the ends of the feed screws 173 engage, worm wheels 176 secured on the feed screws 173, worms 177 meshing with the worm wheels 176, shafts 178 on which the worms 177 are secured, bevel gears 17 9 secured on the shafts 178, bevel gears 180 meshing with the bevel gears 179, a shaft 181 on which the bevel gears 179 and 180 are secured, bearings 182 in which the shaft 181 is mounted, a gear183 secured on the shaft 181, change speed gearing 184 whereby the travel of the sliding carriage may be varied,

friction driving mechanism 185, mechanism 186 for rendering the friction mechanism 185 operative or inoperative as desired, and mechanism 187 for shifting one of the friction wheels across the face of the other to vary the feed and to reverse it.

The change speed gearing 184- comprises a gear 188 secured on the shaft 189, gears 190 and 191 splined on the shaft 189, bearings 192 and 193 in which the shaft 189 is mounted, gears 194 and 195 for engagement with the gears 191 and 190, respectively. a shaft 196 on which the gears 194 and 195 are secured, and bearings 197 and 198 in which theshaft 196 is mounted.

The friction drive mechanism 185 comprises a friction disk 199 secured on the shaft 196 and a friction disk 200 splined on the countershaft 166 and shiftable therealong by means of the mechanism 187.

The mechanism 186 for rendering the friction drive mechanism operative or inoperative as desired, comprises a mechanism 201 which in one position holds the friction disk 191 in engagement with the friction disk 200 and in another position holds the friction disks out of engagement with each other, a link 202 connected with the mechanism 201 for moving it from one position to the vother, a rock arm 203 to which the link 202 is pivoted, a rock shaft 204 on which the rock arm-203 is secured, bearings 205 and 205 in which the rock shaft 204 is mounted, an operating lever 206 secured to the rock shaft 204 and a quadrant or keeper 207 for holding the lever 206 in any position'to which it may be moved. The mechanism 187 for shifting the friction disk 200 along the face of the disk 199 comprises a yoke 208 for engaging the grooved hub of the friction disk 200, a handle 209 for shifting the yoke 208, and a support or rest 210 for engaging the handle 209 to prevent its rotating with the friction disk 200. v

The mechanism 140 for causing the rotation of the boring shaft comprises a spur gear 211, a spur gear 212 meshing with the spur gear 211 and mounted on the countershaft 166, a shaft 213 on which the gear 211 is secured, a bearing 214 in which the shaft 213 is mounted, clutch mechanism 215 for throwing the boring shaft into and out of operation, a shaft 216 connected with one of the clutch members, a bearing 217 in which the shaft 216 is mounted, a chain wheel or sprocket 218 secured on the shaft 216, a chain 219 engaging the chain wheel 218, a chain wheel 220 alsoengaged by the chain 219, a shaft 221 on which the chain wheel 220 is secured, and a gear reduction 222 (which may be a planetary gear mechanism similar to the planetary gearing shown in Figs. 1, 2 and 3) for transmitting motion from the shaft 221 to the boring shaft 223. The shaft 216 is connected with or This thrust bearing is secured on the sliding carriage, 137 and engages the rear face of the gear member 146. A conveyer 231 is provided to carry away the material removed by the boring mechanism and a controller 232 is provided for the motor. Any suitable mechanism 233 may be provided for shifting the gears 190 and 191. shown comprises a lever 234 the end of which engages the hub of the gears, and tothe other end of which is connected an operat-.

ing rod235 terminating in a handle 236.

The use and operation of improved machine is as follows: The roller carriage 136 is secured firmly in position on the track in any suitable manner. Assuming that the cutter has just reached the desired outer limit ofit's radial travel and that the revers ing mechanism 167 is in a position which will cause the cutter to travel st1l1 farther The mechanism radially outward, the operator will shift the reversing mechanism 167 to a position in which both of the gears 158 and 159 will be out of mesh with the gears 160. This will stop the radial feed of the cutter, that is, the cutter will not be moved either in or out. The cutter will be allowed to complete a revolution in this position to make the outer cut truly circular. The reversing mecha nism 167 will then be operated to cause the cutter to move radially inward. When the cutter'has been brought in as far as desired the reversing mechanism is again operated to shift the gears 158 and 159 to a position in which neither of them will mesh with the gear 160. 'The gears 190 and 191 are moved to aposition in which the gear 191 meshes with the gear 194 and in which the gear 190 is out of mesh with the gear 195; or in other words in a position to cause a slow travel of the sliding carriage 137. The mechanismv 186 is then operated to bring the friction disk 199 into engagement with the friction disk 200 to cause a forward movement of the sliding carriage 137 As the sliding carriage 187 advances the cutter 23 makes a. central cut. When this central out has been made deep enough the mechanism 186 is operated to move the friction disk 199 out of engagement with the friction disk 200. The reversing mechanism 167 is then operated to shift the gears 158 and 159 to a position in which the cutter 22 will be caused to travel radially outward. These operations are repeated until the sliding carriage has been moved forwardly as far as practicable when the mechanism is operated to cause the withdrawal of the sliding carriage and the rolling carriage is then moved forward on the track. The withdrawing of the sliding carriage is accomplished by shifting the friction disk 200 across the face of the friction disk 199 until it engages the friction disk 199 on the opposite side of the axis. In order to quickly withdraw the carriage the gears 190 and 191 are shifted to a position in which the gear 190 engages the'gear 195 and he gear 191 is out of engagement with the gear 19% which will cause a quicker travel of the sliding carriage.

The boring bar 2-1. may be fitted with two 0* more cutters at any positions as desired for differentmaterial encountered or for different methods of operation. The forward feed may be made uniform, at a slow speed to cut the material encountered fine instead of large pieces as described above.

in the modification of 12 and 13 I have shown a boring machine wherein the axial movement of the cutter elfcct-ed by a forward movement of the roller carriage itself by providing suitable transmission between the motor and the wheels of the carriage. The greater portion of the parts are substantially the same as in the modification of Figs. 1, 2, 6, 7, 8, 9, 10 and 11 and are similarly designated. Exceptions or variations are noted hereafter.

The boring mechanism 11 from 21 to 511 is the same. The feed mechanism 12, for causing the boring mechanism to travel in an axial direction is omitted, movement of the whole machine being edected through the wheels. This makes unn cessary the shaft 19 extending through the machine and being'finishcd with a scrcw'thr ad. Shaft 19 ends in the transmission in nism 141. The feed mechanism for caus the horing bar to travel in a radial direction is the same except that bracket 53 is fixed to the front end of the ca 10 as it docs not more out from the main hearing as in Figs.

and 6. This does with guides 63 and 63 and the sliding pelts they support. The brake mechanism (50 and frictioifdrive mechanism 61 remain the same. The motor 14, through the same mechanism, drives the shaft 79 and the driving transmission 14:. which may be one of several standard types on the market. A

The carriage 10 comprises the same parts 16, 17 and 18 except that wheels 17 have the outer flange with the gear teeth meshing with the rack237, secured to the rail 18. L

The axial movement of the carriage is effected through a friction clutch member connection between the member 238 and the shaft 7 9, and a clutch lever and connections 2&0 for operating the expansion clutch means. The traction transmission comprises a spiral gear 241 secured on clutch member 238, a spiral gear 242 meshing with the gear Ql and secured on the shaft 24:3, a worm 24 1 secured on the shaft 243 and meshing with the Worm gear 245, a shaft 9A6 on which the worm gear 24-5. is secured, a sprocket wheel 250 secured to the shaft 249, a sprocket chain 251 engaging sprocket wheel 250, a sprocket wheel engaged by the chain 251 and secured to the axle 253, a sprocket wheel 25 1 secured to the axle 253, a sprocket chain 255'engaging the sprocket wheel 254, a sprocket wheel 256 secured to the axle 257, bearings 258 secured to the carriage 10 in which axles 253 and 257 ro tate and traction wheels 17. The traction wheels 17 have the outer flanges with the teeth 259 meshing with the teeth of the racks 237 secured to thetrack 18.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is V 1. A tunneling machine comprising a rotatable radially movable cutter, a rotatable gear, mechanical means for preventing movement of said gear, and transmission means between said gear and cutter whereby when movement of the gear is prevented the cutter will be moved radially in one direction and whereby when the gear is rotated the cutter will be moved radially in the other direction.

2. A tunneling machine comprising a ro V tatable radially movable cutter, a rotatable gear, mechanical means for preventing movement of said gear, and transmission means between said gear and cutter whereby when movement of the gear is prevented the cutter will be moved radially in one direction and whereby when the gear is rotated he cutter will be moved radially in the other direction, the axis of said gear coinciding with the axis about which the cutter rotates.

3. A tunneling machine comprising :1. r0- tatable radially movable cutter, a rotatable gear, mechanical means for preventing movement of said gear, transmission means between said gear and cutter whereby when movement of the gear is prevented the cutter will be moved radially in one direction and whereby when the gear is rotated the cutter will be moved radially in the other direction, the axis of said gear coinciding with the axis about which the cutter rotates, and a second gear meshing with said first gear and rotatable with the cutter.

4:. A tunneling machine comprising a rotatable radially movable cutter, a gear, me-

chanical means for preventing movement of said gear, transmission meansbetween said gear and cutter whereby when movement of the gear is. prevented the cutter will be moved radially in one direction and whereby when the gear is rotated the cutt will be moved radially in the other direction, the axis of said gear coinciding with the axis about which the cutter rotates, a second gear meshing wi h said first gear androtateole with thee" a rack, ano

driving coon tions between said second gear i the l 5. A tunneling machine comprising a -ro-' M. -1- gear coinciding with the axis e e 1e cutter rotates, a second gear tatable radially movable cutter, a rotatable gear, mechanical means for preventing movement of said gear,- and transmission means between said gearand cutter whereby when movement of the is prevented the I cutter will be moved radially in one direction and whereby when the gear is rotated the cutter will be moved radially in the other direction, said preventing means com prising a brake. v

7. A tunneling machine comprising a rotatable radially-movable cutter, means for causing movement of said cutter comprising a shaft, mechanical means for preventing movement of said shaft, and transmission means between said shaft and cutter whereby when movement of said shaft is prevented said cutter will be moved in one direction,

and whereby when said shaft is rotated the cutter will be moved radially in the other direction.

8. A tunneling machine comprising a rotatable radially-movable cutter, means for causing movement of said cutter comprising a shaft, mechanical means for preventing movement of said shaft, and transmission means between said shaft and cutter whereby when movement of said shaft is prevented said cutter will be moved in one direction, and whereby when said shaft :is rotated the cutter will be moved radially in the other direction, said preventing means comprising brake wheel secured to said shaft.

9. A tunneling machine comprising a rotatable radially-'movable cutter, means for causing movement of said cutter comprising allyin the other direction, the

shaft, mechanicalmeans for preventing movement of said shaft, transmission means betweensaid shaft andcutter whereby when movement of said shaft is prevented said cutter will be moved in one direction, and whereby when saidshaft is rotated the cutter will he moved radially'in theother direction, said means for rotatingthe shaft com,-.

prising twofriction wheels, and'niea-ns for bringing them into and out ofcontact.

l0. A tunneling machine comprising a frame, a rotatable shaft, means formoving said shaft axiallywith respect to said frame,

acutter supported by saidxshaft, transmis sion means for moving said cutter radially with respect to said shaft comprising a sec- 0nd shaft parallel to said first shaft and hav ing a different axis and movablein an axial direction with respect to said frame, a support having a portion embracing said first shaft and movable axially therewith, said support having a bearingin which said second shaft is mounted, and means for pre venting rotation of said support around said first shaft.

a 11. A tunneling machine comprising a name, arotatable shaft, means for moving said shaft axially with respect tosaid frame,

a cutter supported by said shaft, transmission means for moving said cutter radially with respect to said shaft comprising a second shaft parallel to said first shaft and having a different axis and movable in an axial direction with respect to said frame, a support having a bearing in which said second shaft is mounted, and means for preventing rotation of said support around" said first shaft.

12. A tunneling machine comprising a frame, a rotatable shaft, means for moving said shaft axially with respect to said frame,

a cutter supported by said shaft, transmission means for moving said cutter radially with respect to said shaft comprising a sec ond shaft parallel to said first shaft and having a different axis and movable in an axial direction with respect to said frame, and comprising also a gear coaxial with said first shaft and movable axially therewith, and driving connections between said gear. and second shaft, and means for preventing rotation of said second shaft about said first shaft.

13. A tunneling machine comprising a frame, a rotatable shaft, means for moving said shaft axially with respect to said frame, a cutter supported by'said shaft,transmission means for movingsaid cutter radially with respect to said shaft comprising a second shaft parallel to said first shaftand having a difierent axis and movable in an axial direction with respect to said frame, and means for preventing said second shaft from rotating about said first shaft.

14. A tunneling machine comprising a frame, a rotatable shaft, means for moving said shaft axially with respect to said shaft, a cutter supported by said shaft, transmis sion means for moving said cutter radially with respect to said shaft comprising a second shaft parallel to said first shaft and having a different axis and movable in an axial direction with respect to said frame, a support having a portion embracing said first shaft and movable axially therewith, said support having a bearing in which said second shaft is mounted, and means for preventing rotation of said support around said first shaft comprising a slide member secured to said support andslidably mounted with respect tosaid frame.

15. A tunneling machine comprising a frame, a rotatable shaft, means for moving said shaft axially with respect to said frame, a cutter supported by said shaft, transmission means for moving said cutter radially with respect to said shaft comprising a second shaft parallel to said first shaft and hav ing a different axis and movable in an axial direction with respect to said frame, a support having a portion embracing said first shaft and movable axially therewith, said support having a bearing in which said second shaft is mounted, and means for preventing rotation of said support around said first shaft comprising a slide member secured. to said support, and a guide'in which said slide travels.

16. A tunneling machine comprising a rotatable radially movable cutter, a gear, means movable from one position to another which in one position prevents movement of said gear, and transmission means between said gear and cutter whereby when movement of said gear is prevented the cutter will be moved radially in one direction, and whereby when the gear is rotated the cutter will be moved radially in the other direction.

' 17. A tunneling machine comprising a shaft, means for rotating said shaft, means for moving said shaft axially, a cutter supported by said shaft, means for moving said cutter radially with respect to said shaft comprising a second rotatable shaft parallel to said first shaft and having a different axis and driving connections between said shafts. V

In Witness whereof, I have scribed my name.

LE ROY W. CAMPBELL.

hereunto sub- 

